Will my Guardian System interfere with our existing Wi-Fi network?

No defintiely not.   Our wi-fi systems use a specific band width which will not interfere with your current network. 

I don't have speakers. How will I hear the tones generated to evacuate or lock down?

I don't currently have fire panels in all buildings. Does that matter?

Can I use our current Ethernet network as the backbone of the guardian system?

If the Guardian system set up has been zoned, can I communicate with each one individually?

I don't think I need the whole Guardian system. Can you install only a PA system?

Can the Guardian system be set up with multiple Control Dashboards for my different facilities or building groups?